4 Answers

Because we move right along with the earth's rotation.

were used to it

you really don't feel it?  can't you tell the season just by the smell of the air and the breezes?  i used to walk stilts when i could work, i could actually tell the difference between walking on the ground and on stilts, this is part of the reason i live high in the rocky mountians i feel more comfotable at 8000 to 9000 fett altitude, i feel gravity when i leave the pool and it makes me want to go back in, i have had back surgury and i also believe in inversion therapy in small doses, you can tell exactly when your weight heads the other way

cuz it's so big, adn we're so little. And it has a built-in gyroscope, kinda--like a cruise ship has stablelizers so you can't feel it rockin' and rollin'  as much.